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Casey O'Connell, MD, FACP

Photo of Casey O'Connell, MD, FACP
Title(s)Professor of Medicine (Clinical Scholar)
SchoolKeck School of Medicine of Usc
Address1441 Eastlake Ave.
Health Sciences Campus
Los Angeles CA 90033
Phone+1 323 865 3950
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    Other Positions
    Title(s)Lawrence and Janice Kelly Chair in Hematology

    Title(s)Director, Gehr Cures: Myeloid Malignancy Program of USC


    Collapse Biography 
    Collapse awards and honors
    Southern California Top Doctors2026Hall of Fame Super Doctors Legacy Member
    Cayenne Wellness Center and Children's Foundation2024Cayenne Wellness Center Sickle Cell Award
    The Los Angeles Business Journal 2024Leader of influence
    LAC+USC Medical Center 2022Outstanding Faculty Teaching Award
    The Myelodysplastic Syndromes Foundation, Inc. 2022MDS Foundation Nobility in Science Award
    American College of Physicians2017Fellowship in the American College of Physicians (ACP)
    Keck School of Medicine 2016  - 2017Outstanding Year II Teaching Award
    Keck School of Medicine2013Master Teacher Distinction
    LAC+USC Medical Center2013Medical Staff Leadership Recognition Award
    Keck School of Medicine 2012  - 2013Outstanding Year I Teaching Award
    Keck School of Medicine2011  - 2012Best Year I System
    Southern California Top Doctors 2010  - 2024Top Doctors
    Los Angeles Magazine Top Doctors 2010  - 2024Top Doctors Award
    Keck School of Medicine 2008  - 2009Outstanding Year I Teaching Award
    Division of Hematology, USC2006  - 2007Fellow Research Award
    Division of Hematology, USC2004  - 2005Fellow Teaching Award
    USC Department of Medicine2003  - 2004Senior Resident of the Year
    USC Department of Medicine2003  - 2004Brautbar Teaching Award
    Keck School of Medicine2003Outstanding Resident Teaching Award
    George Washington University Department of Medicine2001Jorge C. Rios Award in Internal Medicine
    1999Laszlo M Tauber Scholarship
    George Washington University School of Medicine1998William Beaumont Medical Research Honor Society

    Collapse Overview 
    Collapse overview
    Dr. Casey O’Connell is a Professor of Medicine (Clinical Scholar) in the Jane Anne Nohl Division of Hematology at the Keck School of Medicine, University of Southern California (USC). She did her undergraduate work at Stanford University and completed her medical degree with distinction at the George Washington School of Medicine. She began her career as a clinical researcher at USC’s Norris Comprehensive Cancer Center in the area of cancer-related thrombosis by describing the clinical significance of incidental pulmonary embolism identified on routine cancer staging CT scans. Her original work in this area was published in the Journal of Clinical Oncology and brought this clinical entity to the attention of oncologists worldwide. Dr. O’Connell’s background in cancer-related thrombosis has generated a focused interest in Myeloproliferative Neoplasms (MPNs), which include Polycythemia Vera, Essential Thrombocytosis and Myelofibrosis. In addition to leading clinical treatment trials for patients with these malignancies, she pursues translational research seeking to discover how they induce arterial and venous thrombosis. The MPNs and Myelodysplastic syndrome (MDS) are malignant hematopoietic disorders with pleiotropic clinical manifestations. Dr. O’Connell is interested in optimizing the role of epigenetic therapy in these pre-leukemic conditions that can lead to acute myeloid leukemia.

    As director of the new GEHR CURES Myeloid Malignancy Program, Dr. O’Connell is focused on optimizing therapies and on novel ways to intervene earlier to prevent progression of these disorders. Dr. O’Connell is proudest of her accolades for patient care in Southern California and for teaching at the Keck School of Medicine.

    Collapse ORNG Applications 
    Collapse Clinical Trials

    Collapse Bibliographic 
    Collapse selected publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. A plain language summary of the ASCERTAIN trial: oral decitabine and cedazuridine versus intravenous decitabine for MDS or CMML . 2025; 8(21):929-941. Guillermo Garcia-Manero 1, James McCloskey 2, Elizabeth A Griffiths 3, Karen W L Yee 4, Amer M Zeidan 5, Aref Al-Kali 6, H Joachim Deeg 7, Mitchell Sabloff 8, Mary-Margaret Keating 9, Nancy Zhu 10, Nashat Y Gabrail 11, Salman Fazal 12, Joseph Maly 13, Olatoyosi Odenike 14, Amy E DeZern 15, Casey L O'Connell 16, Gail J Roboz 17, Lambert Busque 18, Rena Buckstein 19, Harshad Amin 20, Brian Leber 21, Aditi Shastri 22, Aram Oganesian 23, Harold N Keer 23, Mohammad Azab 24, Michael R Savona 25. View Publication.
    2. A multicenter study to assess efficacy, safety, and tolerability of ropeginterferon alfa-2b-njft in patients with essential thrombocythemia in the US and Canada: EXCEED-ET trial. 2025; 12(17). Masarova L, Reeves BN, El Chaer F, Foltz L, Tashi T, Abu-Zeinah G, Lucas J, Halpern AB, Maze D, Qin A, Safah H, Lan F, O'Connell CL, Goel S, Rein L, Fang B, How J, Babu S, Li Z, Cerquozzi S, Oh ST, Hunter AM, Podoltsev N, Vachhani P, Yacoub A, Cunningham JM, Hillis C, Otoukesh S, Zagrijtschuk O, Castro H, Bose. View Publication.
    3. Novel Approaches to the use of hypomethylating agents in myeloid malignancies. 2025; 16(17):1201-1212. Cheng J, O'Connell C. View Publication.
    4. Idiopathic erythrocytosis: A diagnostic and management challenge with emerging areas for exploration. Br J Haematol. 2024 03; 204(3):774-783. O'Neill C, O'Connell C. PMID: 38262687.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    5. Oral decitabine-cedazuridine versus intravenous decitabine for myelodysplastic syndromes and chronic myelomonocytic leukaemia (ASCERTAIN): a registrational, randomised, crossover, pharmacokinetics, phase 3 study. Lancet Haematol. 2024 Jan; 11(1):e15-e26. Garcia-Manero G, McCloskey J, Griffiths EA, Yee KWL, Zeidan AM, Al-Kali A, Deeg HJ, Patel PA, Sabloff M, Keating MM, Zhu N, Gabrail NY, Fazal S, Maly J, Odenike O, Kantarjian H, DeZern AE, O'Connell CL, Roboz GJ, Busque L, Buckstein R, Amin H, Randhawa J, Leber B, Shastri A, Dao KH, Oganesian A, Hao Y, Keer HN, Azab M, Savona MR. PMID: 38135371.
      View in: PubMed   Mentions: 23     Fields:    Translation:HumansCTClinical Trials
    6. Guadecitabine vs TC in relapsed/refractory AML after intensive chemotherapy: a randomized phase 3 ASTRAL-2 trial. 2024; 8(23):2020-2029. Gail J Roboz 1, Guillermo Sanz 2, Elizabeth A Griffiths 3, Karen Yee 4, Hagop Kantarjian 5, Christian Récher 6, Michael T Byrne 7, Elzbieta Patkowska 8, Hee-Je Kim 9, Xavier Thomas 10, Ine Moors 11, Wendy Stock 12, Árpád Illés 13, Pierre Fenaux 14, Yasushi Miyazaki 15, Takahiro Yamauchi 16, Casey L O'Connell 17, Yong Hao 18, Harold N Keer 18, Mohammad Azab 18, Hartmut Döhner 19. View Publication.
    7. Phase 2 study of add-on parsaclisib for patients with myelofibrosis and suboptimal response to ruxolitinib: final results. 2024; 6(8):1515-1528. Abdulraheem Yacoub 1, Uma Borate 2, Raajit K Rampal 3, Haris Ali 4, Eunice S Wang 5, Aaron T Gerds 6, Gabriela Hobbs 7, Marina Kremyanskaya 8, Elliott Winton 9, Casey O'Connell 10, Swati Goel 11, Stephen T Oh 12, Gary Schiller 13, James McCloskey 14, Jeanne Palmer 15, Houston Holmes 16, Steven Hager 17, Albert Assad 18, Susan Erickson-Viitanen 19, Feng Zhou 20, Naval Daver 21. View Publication.
    8. A Dynamic, D-dimer-based Thromboprophylaxis Strategy in Patients with COVID-19. 2024; 13(11):887. Lantarima Bhoopat 1 2, Anastasia Martynova 1, April Choi 3, Pattharawin Pattharanitima 2, Semi Han 1, Senxi Du 1, Ibrahim Syed 1, Catherine Chan 4, Esther E Oh 4, Zea Borok 1 5, Janice Liebler 1, Melissa Lee Wilson 6, Pichaya Tantiyavarong 2, Casey O Connell 1. View Publication.
    9. Clinical and pathological features of clonal cytopenia of undetermined significance presenting with isolated thrombocytopenia (CCUS-IT). Eur J Haematol. 2024 Apr; 112(4):594-600. O'Neill C, Nwachukwu N, Vergara-Lluri M, Hagiya A, O'Connell CL. PMID: 38088145.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    10. Momelotinib versus danazol in symptomatic patients with anaemia and myelofibrosis (MOMENTUM): results from an international, double-blind, randomised, controlled, phase 3 study. Lancet. 2023 01 28; 401(10373):269-280. Verstovsek S, Gerds AT, Vannucchi AM, Al-Ali HK, Lavie D, Kuykendall AT, Grosicki S, Iurlo A, Goh YT, Lazaroiu MC, Egyed M, Fox ML, McLornan D, Perkins A, Yoon SS, Gupta V, Kiladjian JJ, Granacher N, Lee SE, Ocroteala L, Passamonti F, Harrison CN, Klencke BJ, Ro S, Donahue R, Kawashima J, Mesa R, MOMENTUM Study Investigators. PMID: 36709073.
      View in: PubMed   Mentions: 72     Fields:    Translation:HumansCTClinical Trials
    11. Safety, Outcomes, and T-Cell Characteristics in Patients with Relapsed or Refractory MDS or CMML Treated with Atezolizumab in Combination with Guadecitabine. Clin Cancer Res. 2022 12 15; 28(24):5306-5316. O'Connell CL, Baer MR, Ørskov AD, Saini SK, Duong VH, Kropf P, Hansen JW, Tsao-Wei D, Jang HS, Emadi A, Holmberg-Thyden S, Cowland J, Brinker BT, Horwood K, Burgos R, Hostetter G, Youngblood BA, Hadrup SR, Issa JP, Jones P, Baylin SB, Siddiqi I, Grønbaek K. PMID: 36222848; PMCID: PMC9772102.
      View in: PubMed   Mentions: 9     Fields:    Translation:HumansCellsCTClinical Trials
    12. Anagrelide for platelet-directed cytoreduction in polycythemia vera: Insights into utility and safety outcomes from a large multi-center database. Leuk Res. 2022 08; 119:106903. Rippel N, Tremblay D, Zubizarreta N, Podoltsev N, Gotlib J, Heaney M, Kuykendall A, O'Connell C, Shammo JM, Fleischman A, Kremyanskaya M, Hoffman R, Mesa R, Yacoub A, Mascarenhas J. PMID: 35717689; PMCID: PMC11583043.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    13. A randomized phase 3 trial of interferon-α vs hydroxyurea in polycythemia vera and essential thrombocythemia. Blood. 2022 05 12; 139(19):2931-2941. Mascarenhas J, Kosiorek HE, Prchal JT, Rambaldi A, Berenzon D, Yacoub A, Harrison CN, McMullin MF, Vannucchi AM, Ewing J, O'Connell CL, Kiladjian JJ, Mead AJ, Winton EF, Leibowitz DS, De Stefano V, Arcasoy MO, Kessler CM, Catchatourian R, Rondelli D, Silver RT, Bacigalupo A, Nagler A, Kremyanskaya M, Levine MF, Arango Ossa JE, McGovern E, Sandy L, Salama ME, Najfeld V, Tripodi J, Farnoud N, Penson AV, Weinberg RS, Price L, Goldberg JD, Barbui T, Marchioli R, Tognoni G, Rampal RK, Mesa RA, Dueck AC, Hoffman R. PMID: 35007321; PMCID: PMC9101248.
      View in: PubMed   Mentions: 53     Fields:    Translation:HumansCTClinical Trials
    14. European LeukemiaNet Response Predicts Disease Progression but Not Thrombosis in Polycythemia Vera. Hemasphere. 2022 Jun; 6(6):e721. Tremblay D, Srisuwananukorn A, Ronner L, Podoltsev N, Gotlib J, Heaney ML, Kuykendall A, O'Connell CL, Shammo JM, Fleischman A, Mesa R, Yacoub A, Hoffman R, Moshier E, Zubizarreta N, Mascarenhas J. PMID: 35747843; PMCID: PMC9208865.
      View in: PubMed   Mentions: 9  
    15. Addition of Navitoclax to Ongoing Ruxolitinib Therapy for Patients With Myelofibrosis With Progression or Suboptimal Response: Phase II Safety and Efficacy. J Clin Oncol. 2022 05 20; 40(15):1671-1680. Harrison CN, Garcia JS, Somervaille TCP, Foran JM, Verstovsek S, Jamieson C, Mesa R, Ritchie EK, Tantravahi SK, Vachhani P, O'Connell CL, Komrokji RS, Harb J, Hutti JE, Holes L, Masud AA, Nuthalapati S, Potluri J, Pemmaraju N. PMID: 35180010; PMCID: PMC9113204.
      View in: PubMed   Mentions: 54     Fields:    Translation:HumansCTClinical Trials
    16. Tranexamic Acid in the Treatment of Refractory Gastrointestinal Arteriovenous Malformation Bleeding in Left Ventricular Assist Device Patients. Circ Heart Fail. 2022 01; 15(1):e008669. Fong MW, Morningstar-Kywi N, O'Connell C, Qureshi U, Han EE. PMID: 34807724.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    17. Ruxolitinib discontinuation in polycythemia vera: Patient characteristics, outcomes, and salvage strategies from a large multi-institutional database. Leuk Res. 2021 10; 109:106629. Tremblay D, Ronner L, Podoltsev N, Gotlib J, Heaney M, Kuykendall A, O'Connell C, Shammo JM, Fleischman A, Mesa R, Yacoub A, Hoffman R, Moshier E, Zubizarreta N, Mascarenhas J. PMID: 34082375.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    18. Treatment of Cancer-Associated Venous Thromboembolism with Low-Molecular-Weight Heparin or Direct Oral Anticoagulants: Patient Selection, Controversies, and Caveats. Oncologist. 2021 01; 26(1):e8-e16. O'Connell C, Escalante CP, Goldhaber SZ, McBane R, Connors JM, Raskob GE. PMID: 33275319; PMCID: PMC7794180.
      View in: PubMed   Mentions: 29     Fields:    Translation:Humans
    19. Extrapulmonary manifestations of severe acute respiratory syndrome coronavirus-2 infection. J Med Virol. 2021 05; 93(5):2645-2653. Rosen HR, O'Connell C, Nadim MK, DeClerck B, Sheibani S, DePasquale E, Sanossian N, Blodget E, Blodget E, Angell T. PMID: 33090515; PMCID: PMC7675751.
      View in: PubMed   Mentions: 11     Fields:    Translation:HumansCellsPHPublic Health
    20. ACVR1/JAK1/JAK2 inhibitor momelotinib reverses transfusion dependency and suppresses hepcidin in myelofibrosis phase 2 trial. Blood Adv. 2020 09 22; 4(18):4282-4291. Oh ST, Talpaz M, Gerds AT, Gupta V, Verstovsek S, Mesa R, Miller CB, Rivera CE, Fleischman AG, Goel S, Heaney ML, O'Connell C, Arcasoy MO, Zhang Y, Kawashima J, Ganz T, Kowalski M, Brachmann CB. PMID: 32915978; PMCID: PMC7509854.
      View in: PubMed   Mentions: 58     Fields:    Translation:HumansCTClinical Trials
    21. Oral cedazuridine/decitabine for MDS and CMML: a phase 2 pharmacokinetic/pharmacodynamic randomized crossover study. Blood. 2020 08 06; 136(6):674-683. Garcia-Manero G, Griffiths EA, Steensma DP, Roboz GJ, Wells R, McCloskey J, Odenike O, DeZern AE, Yee K, Busque L, O'Connell C, Michaelis LC, Brandwein J, Kantarjian H, Oganesian A, Azab M, Savona MR. PMID: 32285126; PMCID: PMC7414597.
      View in: PubMed   Mentions: 78     Fields:    Translation:HumansCellsCTClinical Trials
    22. Persistent leukocytosis in polycythemia vera is associated with disease evolution but not thrombosis. Blood. 2020 05 07; 135(19):1696-1703. Ronner L, Podoltsev N, Gotlib J, Heaney ML, Kuykendall AT, O'Connell C, Shammo J, Fleischman AG, Scherber RM, Mesa R, Yacoub A, Perkins C, Meckstroth S, Behlman L, Chiaramonte M, Salehi M, Ziadkhanpour K, Nguyen H, Siwoski O, Hung AK, Janania Martinez M, Nguyen J, Patel S, Kollipara R, Dave A, Randall M, Grant M, Harrison M, Fernandez Soto P, Tremblay D, Hoffman R, Moshier E, Mascarenhas J. PMID: 32107559; PMCID: PMC7205813.
      View in: PubMed   Mentions: 41     Fields:    Translation:Humans
    23. The TEMPI syndrome. Blood. 2020 04 09; 135(15):1199-1203. Sykes DB, O'Connell C, Schroyens W. PMID: 32108223.
      View in: PubMed   Mentions: 20     Fields:    Translation:Humans
    24. A Retrospective Study of the Combination of Rituximab, Cyclophosphamide and Dexamethasone for the Treatment of Relapsed/Refractory Warm Antibody Autoimmune Hemolytic Anemia. Acta Haematol. 2020; 143(3):244-249. Piatek CI, Bocian H, Algaze S, Weitz IC, O'Connell C, Liebman HA. PMID: 31665725.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    25. Unsuspected pulmonary emboli adversely impact survival in patients with cancer undergoing routine staging multi-row detector computed tomography scanning. J Thromb Haemost. 2011 Feb; 9(2):305-11. O'Connell C, Razavi P, Ghalichi M, Boyle S, Vasan S, Mark L, Caton A, Duddalwar V, Boswell W, Grabow K, Liebman HA. PMID: 20955348.
      View in: PubMed   Mentions: 43     Fields:    Translation:Humans
    26. Managing cancer-related venous thromboembolic disease: low-molecular-weight heparins and beyond. Expert Rev Hematol. 2008 Dec; 1(2):175-82. O'Connell CL, Liebman HA. PMID: 21082922.
      View in: PubMed   Mentions:    Fields:    Translation:HumansAnimals
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